Society & Culture2 mins ago
ben nevis
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The height of Ben Nevis
There is great controversy regarding the true height of Ben Nevis. The l794 map of Scotland proclaimed, "Ben Nevis is, at 437Oft the highest mountain in Great Britain", although it shouId be remembered that this new, map was simply an updated version of the 1782 map drawn by Lt. Campbell. By "Updated' it is meant that this was the first map showing the summit of Ben Nevis as Britain's highest point prior to this it had been accepted that the Cairngorm area held this claim to fame.
Many people (and many reference books) still give the incorrect height of 4406ft. The post-war triangulation of 1964 gave the new height of 4418ft. But, and this is the main point, this height was that of the Flush Bracket at the base of the Survey Levelling plate built into the base of the Triangulation pillar and NOT of the ground height. As the pillar on the cairn is nine and a half feet high this makes the actual ground height of 4408ft 6 inches. Mountain heights are, by tradition, rounded down so the true height of Ben Nevis is 4,408ft. All mountain heights in Britain are calculated from their altitude above Ordnance Datum which is the average elevation of the sea at Newlyn in Cornwall.